Carburetor



1935. 1. STEINHARDT 1,988,817

" CARBURETOR I Filed M3. 12, 1932 INVENTOR jrvizzgfiezzakardt ILL ATTORNEY Patented Jan. 22, 1935 UNITED: STATES PATENT OFFICE;

Irving Steinhardt, New York, NY.

Application February 12, 1932, Serial No. 592,493 I 9 Claims.

This invention relates to an improvement in a carburetor for explosive engines, the present invention being in the nature of an improvement upon the arrangement shown and described in my Patent No. 1,888,248, issued Nov. 22nd, 1932.

In. engines used for driving automobiles and the-.likez-itis aknown-fact that when the automobile. is travelling at good speed along a level highway the explosive mixture furnished bythe carburetor may advantageously be considerably leaner than .when the engine is operating at slower speeds or whendriving the vehicle up an incline, also that where the carburetor of the enginefeeds its gasoline into the air blastthrough an aperture of a. given size the resultant mixtureof airand gas is. relatively leaner at low speeds than at higher speeds.

It is an object of the present invention there fore to provide improved simple, practical and efiicient'means for causing the mixture to beautomatically made leaner in proportion to increasing. speed. of the .engine.

A further :object is to provide improved means fortemporarily enrichening the mixture delivered 25 by the carburetor whenever the throttle ismoved toward open .position.

A, further object is'to so construct the carburetor. asto perform the above objects without necessity for the use of anymechanically operated governors or the-like connected with the engine shaft. I V A further and more detailed object is to-so construct the carburetor. that it willinclude an air intakevalve-and connections between said valve. and: the mixture controlling needle valve whereby the.- effects of saidneedle valve will be modifiedat different engine speeds by action of said .air .valve.

Othenobjects andaims of the invention, more or. less :specificthanthose referred :to above, will beinpart obvious and inpart pointed out in the course. of the following-description of the elements, combinations, arrangements ofparts and applications of principlesconstituting the invention;rand:the scope of protection contemplated will be indicated in theappended claims.

In the-accompanying drawing. which is tobe taken as a part of this specification; and in which I.-have-shown merely a preferred form-of embodiment' of the invention Fig; 1 is a: diagrammatic view of 'a carburetor device:- embodying this invention and showing the same. inoperative association with an explosive engine, and" Fig. Z isa-fragmentary detail view taken at right angles tothe view Fig. 1 andshowing'the relationship of parts of 'the valve control illus trated in Fig. 1.

Referringto the drawing for describing-indetail the exemplary structure'illustratedtherein; the reference character.- L indicates the intake manifold of an ordinary explosive engine G.

The carburetor, indicated generally bythe :reference character H, includes the usual gasoline reservoir 1 containingthe float 2'for keeping the gasoline level constant. The jet 3- is arranged within the- Venturi tube 4 which communicates with the passage 5 within .which is arrangedthe throttle valve 6.

Gasoline-enters-the reservoir 1 through a tube as 7, and a supply of air, enters throughapipe as 8 which communicates .with the bottom end of the- Venturi tube.

The usual operating rod 9 is connected with thethrottle valve, as by means of the'radial arm lflsfixedrtothe shaft ofsaid valve for manually controlling the movements of the throttle valve in the customary way; i I s Whenever the throttle ,va1ve'6. isrotated open to admitza larger volume of explosivemixtureinto thecylindersfor accelerating the speed of, the enginethe increased speed of the pistons causes the blast of air, surging around the jet 3' within the Venturi tube to beincreased in velocityrthereby tearing off from-the jet relatively moregasoline, proportionate to-the volume of air passing in a given period, than was torn offa at the lower speed at whichthe engine had'beenx previously running. I

The increase in proportion of gasoline to air would-continue to, grow greater progressively unlessmeans be provided toprevent'it. 7

To this end the present invention proposes the use of a-gasoline needlell or other-suitable means arranged for controlling the amount of gasoline which may pass out ofthejet 3.under diifering conditions. For convenience "of illustration the needle or valve 11 ishere shown to be mounted tomove vertically within a tube 12 at the-bottom of which is formed aseat 13-with which thevalve co.-operates to control movement of gasolineinto the jet 3. The needle or valve ll'is longiutdinally vertically movable within the tube 12 andextend= ing upwardly therefromis a small'rod orlink 14 with which it is connected to the throttle valve 6 at oneside of 'theopivot shaft of saidivalve -as atv 15. so that. opening movementof the throttle valve will lift the rod 14 and the valve 11.

The; connection between therod '14". and the valve; 11. is: of; :..a:: yielding character such as to normally hold the valve and rod in one position but to permit movement of the valve and rod independently of each other upon occasion. As a simple expedient to this end the valve is shown to be hollow with the rod 14 extending downwardly into its hollow interior and having a compression coil spring 16 interengaging between the rod and the valve within the valve. The upper end of the spring bears against the top wall 1'7 of the valve while its lower end bears against a head 18 which is provided at the lower end of the rod.

At one side of the valve 11 is an air valve 19 controlling an air inlet opening 20. This valve is shown as being carried upon a rod 21 and'as being spring pressed to closed position by a' suitable compression coil spring 22 arranged within the body of the carburetor. The opening 20 communicates with the opening 5 for the purpose of supplying fresh air to said opening 5 to mingle with the mixture admitted through the Venturi tube when the engine is turning over at high speeds. 1 Mounted upon a pivot 23 is a horizontal bar 24 which traverses the top" of the valve 11 and extendsinto pivotal connection as at 25 with the valve rod 21.

The pivot 23 is formed upon a slide collar 26 movable longitudinally of the bar 24 and is carried at the free end of an arm 2'7 which is pivoted as at 28 upon the body of the carburetor, said arm being adjustable upon said pivot 28 so as to adjust the pivot 23 longitudinally along the bar 24 as may be necessary to produce the best results in different engines, as will be readily understood.

Where the bar 24 traverses the valve 11 the valve is formed with a suitable shoulder or other appropriate means as 29 for engagement with the bar.

'- The operation of this mechanism is as follows:

When the throttle valve is operated toward open position the rod 14, actuating through the spring 16, will lift the valve 11 away from the seat 13 so that gasoline will flow freely to the jet 3. The speed of the engine will depend upon the amount to which the valve 6 has been turned, and the position of valve 19 will depend upon the speed of the engine. The suction felt within the passage 5 will force the valve 19 open more and more as the speed increases.

It follows-therefore that the valve 11, having been lifted to a certain point by movement of the throttle valve, will be 'moved down again somewhat by engagement of the rod 24 with the shoulder 29 of the valve 11 as the speed of the engineincreases, until the supply of gasoline to the jet 3 is so limited as to affect the engine speed. If the valve 6 be further moved to increase the speed under these conditions, the spring 16 will add its power to the spring 22 and thus increase the resistanceto opening movement of the valve l9. A proper'explosive mixture is thus insured for movement past the valve 6 at all speeds.

As many changes could be made in this construction Without departing from the scope of the invention as defined in the following claims, it is intended that all matter contained in the above description, or shown in the accompanying drawing, shall be interpreted as illustrative only and not in a limiting'sense. Having thus described'my invention, what I claimas newand desired to secure by Letters Patent is:---

1. A carburetorcomprising an air passage, a gasoline jet'within said airpassage, a throttle valve, a control member for determining the gasoline discharge at said gasoline jet, and means including an automatically operating air inlet valve and connections whereby increase in the speed of the engine and the consequent increase in the volume and velocity of air past the auto matic air inlet valve will move said control memher to cause a reduction in the gasoline discharge at said gasoline jet.

2. A carburetor comprising an air passage, a gasoline jet within said air passage, a throttle valve, a control member for determining the gasoline discharge at said gasoline jet, and means including an automatically operating air inlet valve and connections whereby to move the control member to cause a reduction in the gasoline discharge at said gasoline jet in response to an opening movement of the throttle valve and the resultantlincrease in the volume and velocity of air passing the automatic air valve,

3. A carburetor comprising an air passage, a

gasoline jet within said air passage, a throttle valve, a control member for determining the gasoline discharge at said gasoline jet, an air valve automatically to feed air through the carburetor in varying quantities dependent upon the speed of the engine, and connections between the throttle valve, the air valve and the control member to move the control member to cause a reduction in the gasoline discharge at said gaso line jet in response to an opening movement of the throttle valve and an opening movement of the air valve.

I 4. A carburetor comprising an air passage, a gasoline jet within said air passage, a throttle valve, a control member for determining the gasoline discharge at said gasoline jet, connecting means between the throttle valve and the control member by which to move the control member by movement of the throttle valve, said connecting means including a pull rod extending between the control member and the throttle valve and being resiliently extensible to permit movement of the control member independent of movement of the throttle valve, and means automatically operable to move the control member toward closed position independently of movement of the throttle valve and in an amount dependent upon the speed of the engine.

5. A carburetor-comprising an air passage, a gasoline jet within said air passage, a throttle valve, a control member for determining the gasoline discharge at said gasoline jet, connecting means between the throttle valve and the control member by which to move the control member by movement of the throttle valve, said connecting means being resilient to permit movement of the control member independent of movement of the throttle valve, and means to move the control member independently of movement of the throttle valve and to an amount dependent upon the speed of the engine, said last means including an automatic air valve and a member connected with said air valve arranged to press the control member in one direction as said air valve moves open.

6. A carburetor comprising an air passage, a gasoline jet within said air passage, a throttle valve, a control member for determining the gasoline discharge at said gasoline jet, connecting means between the throttle valve and the control member by which to move the control member by movement of the throttle valve, said connecting means being resilient to permit movement of the control member independent of movement of the throttle valve, and means to move the control member independently of movement of the throttlevalve and to an amount dependent upon the speed of the engine, said last means including an automatic air valve, a pivotally mounted bar extending from its point of support into connection with said air valve and having an intermediate part arranged to engage said control member to press the control member in one direction as said air valve moves open.

'7. A carburetor comprising an air passage, a gasoline jet within said air passage, a throttle valve, a control member for determining the gasoline discharge at said gasoline jet, connecting means between the throttle valve and the control member by which to move the control member by movement of the throttle valve, said connecting means being resilient to permit movement of the control member independent of movement of the throttle valve, and means to move the control member independently of movement of the throttle valve and to an amount dependent upon the speed of the engine, said last means including an automatic air valve, a pivotally mounted bar extending from its point of support into connection with said air valve and having an intermediate part arranged to engage said control member to press the control member in one direction as said air valve moves open, together with means by which to adjust the extent of pressure applied to the control member for a given amount of movement of said air valve.

8. A carburetor comprising an air passage, a gasoline jet within said air passage, a throttle valve, a control member for determining the gasoline discharge at said gasoline jet, connecting means between the throttle valve and the control member by which to move the control member by movement of the throttle valve, said connecting means being resilient to permit movement of the control member independent of movement of the throttle valve, and means to move the control member independently of movement of the throttle valve and to an amount dependent upon the speed of the engine, said last means including an automatic air valve, a pivotally mounted bar extending from its point of support into connection with said air valve and having an intermediate part arranged to engage said control member to press the control member in one direction as said air valve moves open, together with means by whichto shift the pivot support of said bar along the length thereof for thereby adjusting the extent of pressure applied to the control member for a given amount of movement of said air valve.

9. A carburetor comprising an air passage, a gasoline jet within said air passage, a throttle valve, 9. control member for determining the gasoline discharge at said gasoline jet, connecting means between the throttle valve and the control member by which to move the control member by movement of the throttle valve, said connecting means being resilient to permit movement of the control member independent of movement of the throttle valve, and means to move the control member independently of movement of the throttle valve and to an amount dependent upon the speed of the engine, said last means including an automatic air valve and a memberconnected with said air valve arranged to press the control member in one direction as said air valve moves open, together with means by which to adjust the extent of pressure applied to the control member for a given amount of movement of said air valve.

IRVING S'I'EINHARDT. 

